Daming Crazy Emperor

Chapter 644 Long-distance communication
Military equipment city, electric power research institute, laboratory building.

In a huge laboratory, Fang Yizhi is seriously preparing with more than ten disciples.

What they were going to experiment with was the telegraph.

This kind of telegraph is not the wireless telegraph of later generations, but the most primitive wired telegraph.

Simply put, a wired telegraph is two circuits composed of two generators, two coils, two switches and several wires, plus auxiliary mechanisms such as copper bells and pendulums.

To put it bluntly, the most primitive telegraph is that two energized coils that can generate magnetic force are placed in two different places, and there are switches on both sides that energize the other coil.

As long as the switch on one side is closed, the coil on the other side will be energized to generate magnetic force, attract the pendulum to the copper bell, and ring the copper bell, it's that simple.

This kind of telegraph can only send out two kinds of signals that can be recognized by people, that is, if it is connected or not, it is 0 and 1 in the terminology of later generations, if it is connected, it is 1, and if it is not connected, it is 0.

Of course, the information that this telegraph can transmit is not limited to 0 and 1.

Because 0 and 1 can represent various meanings through various encodings.

Taichang has not explained this encoding problem to Fang Yizhi in detail. Now, the most important thing is to be able to send and receive this 0 and 1.

In any case, there has to be a signal first, and if you can't send and receive signals, then encoding is meaningless.

Logically speaking, this kind of primitive wired telegraph should be easy to make. In later generations, a primary school student can buy anything and spend a little time to make it.

However, it is not easy to make such a primitive wired telegraph these days.

Technology is a problem, and materials are also a problem.

In terms of technology, Taichang is the only one who really understands electricity these days, and he is still a half-baked guy.

As for Fang Yizhi, he is still in the groping stage with a half-knowledge.

Not to mention the disciples under him, who basically don't understand anything at the moment, so they can help him and do some simple manual work.

Such a group of people have been busy for a long time, and they haven't even connected a simple circuit.

Taichang hurried in and took a look, he couldn't help being taken aback.

What are these guys up to?

To put it bluntly, the original wired telegraph machine just made a few connections. As long as the things are ready, it doesn't take a quarter of an hour for one person to connect them.

It seems that these ten people have been picking up since the morning, right?

He has rushed over from the capital, at least two hours have passed, and these guys are still busy!

How is this going?

He couldn't help asking curiously: "What's the matter, Mizhi, haven't you connected yet?"

Hearing the words, Fang Yizhi looked up, and immediately met a savior, and said eagerly: "Your Majesty, you are here! My minister is suffering from a headache, where do you think the wiring of this switch should be connected?"

Upon hearing this, a group of disciples hurriedly bowed their hands and said, "Students see the emperor."

Taichang waved his hand slightly, then walked over to take a closer look.

Uh, how should I say it?

If you don't disconnect the circuit, the switch naturally cannot be connected.

This is originally a closed circuit, and it is always connected. It doesn't matter where you switch it!

Taichang thought for a while, then raised his hand and said, "Scissors."

Fang Yizhi quickly grabbed a pair of scissors and stuffed them into his hands.

He could have just disconnected any connector in the circuit at will, anyway, as long as one connector is disconnected, the circuit is disconnected.

However, in order to deepen Fang Yizhi's impression, he still chose to pick up a wire connecting the generator and the coil, cut it from the middle with a pair of scissors.

Immediately afterwards, he pinched the two cut ends of the thread and explained: "The switch is used to connect and disconnect the circuit. Your circuit is already connected, and the switch is naturally useless.

This is actually the same as the steam valve. If the steam pipe is already connected, it is useless for you to connect the valve to the outside.

You have to disconnect the steam pipe and connect it to both sides of the valve so that the valve can function as a switch. "

With such an explanation, Fang Yizhi immediately understood.

He immediately ordered two students to peel off a section of the cut thread, and then connected the two wires protruding from the switch with his own hands, and then asked two students to carefully wrap the joint with raw tape.

This one is done.

Immediately afterwards, he took the scissors and walked to the other side, clicked the scissors to cut off the loop, and continued to connect.

Taichang saw that they were struggling to peel the wire, so he couldn't help picking up the peeled wire and looking at it curiously.

My God, there is actually a circle of thin cotton thread like a fishing net inside the thread leather.

He couldn't help asking: "Mizhi, why are you adding cotton thread here?"

Fang Yizhi said helplessly: "Your Majesty, there is no way, this wire cannot be directly wrapped with raw rubber, because the raw rubber is too soft, scratching it casually will cause a hole.

Therefore, Weichen can only be wrapped with vulcanized rubber.

And this vulcanized rubber is a bit viscous after being melted, and it is difficult to evenly adsorb on the bare copper wire.

Weichen could only order someone to wrap thin cotton thread on the outside of the copper wire, so that the vulcanized rubber could be evenly wrapped on the outside of the copper wire. "

Oh, that's what happened.

It seems that this plastic has to be made quickly, otherwise, it would be very troublesome to wrap a thread.

Taichang nodded slightly, and then asked: "It's all right now, can we experiment?"

Fang Yizhi glanced back, nodded immediately and said, "Okay, your majesty, you can try it."

He walked over quickly, ordered the two switches to be placed on the experimental table in the middle, and then ordered the person to open the steam valve.

There was a sound of mechanical transmission, and there was a slight humming sound between the two simple generators.

This proves that the generator has started generating electricity.

Fang Yizhi stretched out his hands impatiently, and pressed the two switches at the same time.

"Ding ding", two crisp bells sounded immediately, it's done!

He couldn't help but excitedly said: "Your Majesty, no problem, the experiment was successful!"

Uh, is that what you call success?

Taichang couldn't help being speechless.

This guy actually put the sending and receiving things side by side, and the switches are also side by side.

Although these two sets of things are the same, but you are so easy to be misunderstood, don't you know?
How about this?

Taichang thought for a while, then raised his hand and said, "Turn off the generator first."

Fang Yizhi quickly ordered someone to close the valve of the generator.

Taichang then explained in detail: "This telegraph is used for long-distance communication, and it sends and receives at the same time. Although both sides can send and receive, you have to separate these two things and place them far away. A little bit. If you put these two things together, why do we still send and receive, wouldn’t it be much faster to talk directly?”

Uh, okay.

Fang Yizhi nodded repeatedly and said: "I understand, I understand, why don't I try first to see if I can do it?"

Taichang said helplessly: "That's fine, it seems that there is no problem with this, you can try it in the laboratory farthest from here first."

Hearing this, Fang Yizhi quickly ordered several students to remove the connecting rod of a generator and steam engine, and moved them to the farthest laboratory, and then ordered several students to hold two coils of wire and put them there.

Taichang looked carefully at the things they used, and couldn't help but sigh slightly.

The conditions at the moment are really rudimentary. The generator is actually a wooden case. The so-called switch is to use a rubber sheet to separate a spring and a small iron plate before binding them together.

And this receiving device, it turned out to be a big bell hanging on the coil, and a small pocket hammer hanging outside!
This set of things is not only crude, but also very troublesome to install.

For example, a generator must be driven by a steam engine, and the steam engine must also have a boiler to burn steam.

In other words, this can only be used for fixed long-distance communication, and it is basically impossible to keep connecting with the movement of the army when it is brought to the battlefield.

Hey, no, it seems to be ok.

Because Daming has infantry fighting vehicles!

The infantry fighting vehicle is also powered by steam, as long as there is a connector for the generator on it, it can communicate through continuous connection!
Even, you can connect the sending switch, receiving device and motor in advance on a specific command vehicle, and then you only need to pull the wire and connect it to communicate!
Taichang was standing there contemplating, Fang Yizhi suddenly came up to him and said cautiously: "Your Majesty, it's done, why don't we try again?"

Of course I have to try again.

Taichang nodded without hesitation: "Let's start."

Fang Yizhi heard the words, and immediately pressed the switch on the table next to him.

This time, the bell next to the switch did not ring immediately, but only after a blink of an eye.

Seeing the bell ringing, Fang Yizhi pressed the switch twice in succession.

After another blink of an eye, the bell next to the switch rang twice again.

They must have agreed in advance, just click here and click there.

From the looks of it, this simple telegraph machine is really all right, the next step is the problem of encoding and decoding.

(End of this chapter)